The phrase "to organize a church" means to create or set up a new church community, with people gathering together to worship and carry out religious activities. Full definition
This is virtually all done from within some form of organized church. (redeeminggod.com)
A few years in, became believers and did the long stint in organized church together. (nakedpastor.com)
Some people anticipate a continuing decline in church membership with a decreasing importance for organized church authorities and institutions. (religion-online.org)